I don't personally own the King's multi-engine videos, but I did do my training with a guy that had them, and I watched them on a couple different occasions.
I'm not a big King Video supporter, but I think they did a really good job with this subject. This would be especially helpful if you wanted to get this before hand and prepare yourself before you actually started your multi training. They go into good detail about all the important information you need, the theory behind single-engine ops, Vmc, and how to successfully fly, manage, and troubleshoot a engine-out scenario.
I believe they did most of the filming in a Beech Duchess, so thats an added plus if thats the airplane you plan on doing your multi in.